/*
 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.max.collect;

import java.util.*;

/**
 */
public class IdentityHashMapping<K, V> implements Mapping<K, V> {

    private final Map<K, V> delegate;

    public IdentityHashMapping() {
        delegate = new IdentityHashMap<K, V>();
    }

    public IdentityHashMapping(int expectedMaxSize) {
        delegate = new IdentityHashMap<K, V>(expectedMaxSize);
    }

    public synchronized V put(K key, V value) {
        return delegate.put(key, value);
    }

    public synchronized V get(K key) {
        final V value = delegate.get(key);
        return value;
    }

    public synchronized boolean containsKey(K key) {
        return delegate.containsKey(key);
    }

    public int length() {
        return delegate.size();
    }

    public void clear() {
        delegate.clear();
    }

    public V remove(K key) {
        return delegate.remove(key);
    }

    public IterableWithLength<K> keys() {
        return new IterableWithLength<K>() {

            public int size() {
                return delegate.size();
            }

            public Iterator<K> iterator() {
                return delegate.keySet().iterator();
            }
        };
    }

    public IterableWithLength<V> values() {
        return new IterableWithLength<V>() {

            public int size() {
                return delegate.size();
            }

            public Iterator<V> iterator() {
                return delegate.values().iterator();
            }
        };
    }

}
